---
url: >-
  /modelling-guides/creating-an-operational-expenditure-model/creating-a-dimension.md
description: Let’s create some of the necessary dimensions.
---

# Creating a Dimension

Let’s create some of the necessary dimensions. Creating a dimension is very simple, we can go to **Dimensions** tab from the Model page and and in the top right of the page there is a **New Dimension** button.

![Creation of a new dimension](/operational-expenditure-model-figures/creation-of-a-new-dimension.png)

Once we hit the **New Dimension** button, a window will pop up to name the dimension. We will create a dimension called **Month** with type **Standard**.
![Month dimension](/operational-expenditure-model-figures/month-dimension.png)

In a dimension we can have alternative hierarchies to allow for multiple ways of reporting on the underlying information within a cube.

We will make a month dimension with two hierarchies. First is a list of months for the Default hierarchy:

```js
All Months
	Jul
	Aug
	Sep
	Oct
	Nov
	Dec
	Jan
	Feb
	Mar
	Apr
	May
	Jun
```

![Month Default Hierarchy](/operational-expenditure-model-figures/month-default-hierarchy.png)

Click on the **Save Changes** in the top right to save the Default Hierarchy.

Next, to create the Quarters hierarchy we will click **Add** located above the hierarchy list.

![Creating a New Hierarchy from Dimension Management page](/operational-expenditure-model-figures/creating-a-new-hierarchy-from-dimension-management-page.png)

Name the new hierarchy as **Quarters** and set its contents as follows:

```js
Full Year
	Q1
		Jul
		Aug
		Sep
	Q2
		Oct
		Nov
		Dec
	Q3
		Jan
		Feb
		Mar
	Q4
		Apr
		May
		Jun
Annual
```

![Month Quarters Hierarchy](/operational-expenditure-model-figures/month-quarters-hierarchy.png)

The annual element at the bottom will be used to hold annual assumptions. Once we have entered the values in a hierarchy, we will hit the **Save Changes** button.